Experimental Study on a Damaged Cable-stayed Bridge Girder Strengthened by Ultra-high Performance Concrete (UHPC)

被引：0

作者：

Yuan S. ^{[1
]}

Yan D.-H. ^{[1
]}

Wang W.-X. ^{[2
]}

Liu Y. ^{[3
]}

Guo X. ^{[1
]}

Peng K.-S. ^{[1
]}

Yuan M. ^{[1
]}

机构：

[1] School of Civil Engineering, Changsha University of Science and - Technology, Hunan, Changsha

[2] College of Civil Engineering, Hunan University, Hunan, Changsha

[3] Institute of Road and Bridge Engineering, Hunan Communication Engineering Polytechnic, Hunan, Changsha

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 09期

关键词：

bridge engineering; concrete cable-stayed bridge; model test; reinforcement; static performance; ultra high performance concrete;

D O I：

10.19721/j.cnki.1001-7372.2023.09.007

中图分类号：

学科分类号：

摘要：

Based on the excellent performance of ultra-high-performance concrete (UHPC) and its applications in the flexural capacity strengthening of concrete structures, a method of strengthening a damaged girder of a concrete cable-stayed bridge with reinforced UHPC was proposed. A model test was conducted on a seriously damaged girder strengthened by UHPC to explore the performance enhancement of the cable-stayed bridge system. The test results show a good overall cooperative performance of the reinforcement construction method with UHPC for the concrete cable-stayed bridge girder. Debonding failures between the UHPC layer and the original concrete girder are not found during the tests. The cracking load of the strengthened girder increased by 79. 9% compared with the original undamaged main beam. The large numbers of cracks with small gaps and narrow widths on the UHPC layer were found, which can effectively suppress the crack propagation on the original concrete girder. The strengthened cable-stayed bridge system has good recovery capacity and mechanical performance after loading process even under different cases of crack widths and seriously damaged situations. After strengthened by UHPC layer, the flexural capacity of the girder increases while the ultimate bearing capacity of the cable-stayed bridge system will not be limited. The cable stress only achieved 70. 2% to its ultimate strength when the strengthened girder was damaged. The system stiffness of the cable-stayed bridge with severely damaged girder is effectively improved. The system stiffness with UHPC strengthened girder before the cracking load increased by 11. 3% compared to the case with undamaged girder and 29. 5% compared to the case with normal reinforcement girder, respectively. The work demonstrate the significant performance of UHPC to strengthen the flexural capacity of cable-stayed bridge girder, and show the promising future of the proposed method in practices. © 2023 Xi'an Highway University. All rights reserved.

引用

页码：83 / 95

页数：12

共 34 条

[1] LI Hong-jiang, LI Wan-heng, ZHANG Jin-quan, Et al., Construction control for removal of the closure segment in an existing prestressed concrete cable-stayed bridge [J], Journal of Highway and Transportation Research and Development, 25, 8, pp. 61-66, (2008)
[2] LI Hong-jiang, LI Wan-heng, ZHANG Jin-quan, Et al., Rehabilitation and strengthening of Yonghe Bridge in Tianjin [J], World Bridges, 37, 1, pp. 53-56, (2009)
[3] LI Hong-jiang, LI Wan-heng, ZHANG Jin-quan, Et al., Adjustment of alignment of main girder after removal of closure segment in Tianjin Yonghe Bridge [J], Journal of Highway and Transportation Research and Development, 26, 6, pp. 98-103, (2009)
[4] LEI Jin-sheng, WANG Yong-fei, DAI Xiao-dong, The design of the maintenance and reinforcement of Changsha Yin-penling Xiangjiang Bridge [J], Highway Engineering, 35, 4, pp. 97-99, (2010)
[5] ZHANG Y, FANG Z, JIANG R N, Et al., Static performance of a long-span concrete cable-stayed bridge subjected to multiple-cable loss during construction [J], Journal of Bridge Engineering, 25, 3, pp. 1-16, (2020)
[6] ZOU Ze-xi, CHEN Yun-hai, Analysis of controlling cable-stayed bridge in the whole process of construction and maintenance [J], Journal of Highway and Transportation Research and Development, 31, 4, pp. 100-105, (2014)
[7] SUN Quan-sheng, YU Hai-tao, XU Sheng-qi, Static load test on reinforced concrete cable-stayed bridge with rare cables strengthened by external prestressed steel strand [J], Journal of Chang'an University (Natural Science Edition), 41, 1, pp. 39-49, (2021)
[8] YANG X X, YUAN H T, LI C, Et al., Experimental studies on behavior of failed CRB750 steel bars reinforced concrete beams retrofitted with steel plate [J], Engineering Structures, 243, (2021)
[9] JIN Hui, XU Yue, JIANG Feng-hua, Et al., Bending behavior experiment of re beams with U-shaped steel and concrete composite reinforcement [J], China Journal of Highway and Transport, 33, 9, pp. 206-214, (2020)
[10] PENG Hui, GUO Heng-liang, ZHONG Zheng-qiang, Et al., Experimental study on t-section re beams shear-strengthened with prestressed NSM CFRP [J], China Journal of Highway and Transport, 35, 2, pp. 159-168, (2022)

← 1 2 3 4 →